Home / 428,915.60-643,529.40-148,461.20

Finding the Fourth Proportional to 428,915.60, 643,529.40 and 148,461.20

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Solution

The fourth proportional to 428,915.60, 643,529.40 and 148,461.20 is: 222,745.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,915.60 : 643,529.40 = 148,461.20 : x
  2. Step 2: Convert to fraction form
    428,915.60/643,529.40 = 148,461.20/x
  3. Step 3: Cross multiply
    428,915.60x = 643,529.40 × 148,461.20
  4. Step 4: Simplify right side
    428,915.60x = 95,539,146,959.28
  5. Step 5: Solve for x
    x = 95,539,146,959.28/428,915.60
  6. Step 6: Final answer
    x = 222,745.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.